二选一。 The cast is giving (its, their) best performance tonight. Most mystery stories(侦探小说) don’t end the way you expect (it, them) to. Because the United States uses more oil than (it, they) can produce, it has to import great quantities from other countries. Something strange happened, didn’t (it, they)? The plans each (has, have) their advantages and disadvantages. I wouldn’t trust (anyone’s else, anyone else’s) judgement. Everybody, including (I, me), failed the test. To (who, whom) should I address this letter? I found (his, him) lying by the roadside. The bush is dying: (it’s, its) leaves are covered with mildew(霉).